5 people A, B, C, D, E are standing in a queue. B is behind A. D is in front of E. C is between B and D. A is not at the front. Who is at the front of the queue?

Question

Accepted Answer

(C) D. Explanation: D is in front of E, so D...E. C is between B and D: B...C...D...E. B is behind A: A...B...C...D...E. A is not at front, so someone is before A — but the constraints only give us 5 people A,B,C,D,E with this order. Let me re-read: B is behind A means A is in front of B. So order: A,B,C,D,E — A is at front. But 'A is not at the front' — contradiction. Let me reconsider: maybe A...B,C between B and D so B,C,D,E order with A behind all? This question needs re-reading. D is first in the D-E pair. If A is not at front, and A is in front of B, then someone else is in front of A. The only one not placed yet as behind someone else is D. So D is at the front: D, A or E, then B, C... This is complex. Answer: D is at the front.